首次显示一个ViewController时，调用顺序如下：
viewWillAppear:
viewWillLayoutSubviews
viewDidLayoutSubviews
viewDidAppear
当VC1 切换到VC2时，调用顺序如下：
VC1：viewWillDisappear：
VC2：viewWillAppear:
VC2：viewWillLayoutSubviews
VC2：viewDidLayoutSubviews
VC2：viewDidAppear:
VC1：viewDidDisappear:
其中如果viewWillLayoutSubviews和viewDidLayoutSubviews调用过之后，那么如果ViewController的frame没有发生过改变，那么是不会再次调用的。比如从VC2在返回到VC1时，VC1只会调用appear和disappear相关函数，willLayout和didLayout是不会被调用的。
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(UIViewController *)topViewController {UIViewController *...
UIViewController *presentedVC = [[UIViewController alloc]...
UIViewController * releaseVC = [[UIViewController alloc] ...
+(UIViewController *)getCurrentVC { UIViewController *res...
本文标题：UIViewController appear disappea
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